摘要
改变传统合成工艺，在热塑性酚醛树脂合成过程中加入1种有机酸A，得到低游离酚酚醛树脂。考察了酚、醛物质的量比，有机酸A用量对树脂软化点的影响以及反应温度、反应时间对树脂中游离酚含量的影响。确定了最佳合成工艺条件：第1步反应温度98～104℃，反应时间1h，催化剂盐酸用量1．0％（基于苯酚质量），苯酚、甲醛和有机酸A的物质的量比为1：0．82：0．02；第2步反应温度180℃，反应时间1．5h。通过气相色谱分析游离酚质量分数由原来的5％～10％降到0．55％。
A novolac PF with low free phenol was synthesized by adding an organic acid A which changed the traditional technology. The effect of molar ratio of phenol to formaldehyde and the content of organic acid A on soften point of resin was investiged. The influence of reaction temperature and time on free phenol in the product was also studied. The optimum conditions were as followed： the first step reaction temperature 98 - 104 ℃, reaction timelh, the amount of catalyst hydrochloric acid 1.0% （based on phenol mass）, the molar ratio of phenol to formaldehyde to organic acid A 1： 0.82：0.02 and the second step reaction temperature180 ℃, reaction time was 1.5 h. Free phenol of synthesized novolac PF decreased from 5% - 10%to 0.55% detected by gas chromatography.
出处
《热固性树脂》
CAS
CSCD
2008年第3期29-31,共3页
Thermosetting Resin
基金
国家林业局948重大项目“生物质基高分子新材料技术引进与创新”资助(2006-4-C03)
关键词
酚醛树脂
有机酸
低游离酚
phenol - formaldehyd
organic acid
free phenol
